code: def test_config(self):
      optimizer = Ftrl(
          learning_rate=0.05,
          learning_rate_power=-0.2,
          initial_accumulator_value=0.4,
          l1_regularization_strength=0.05,
          l2_regularization_strength=0.15,
          l2_shrinkage_regularization_strength=0.01,
          beta=0.3,
      )
      self.run_class_serialization_test(optimizer)
  
file_path: keras/keras/optimizers/ftrl_test.py
imports: import numpy
  from keras import backend
  from keras import testing
  from keras.optimizers.ftrl import Ftrl
label_desc: Use image node_id 1 for calling the FtrlTest obj's underlying member method code with example usage: obj.test_config() without return types